/* ═══════════════════════════════════════════════════════════
   dang_nhap.css - Trang dang nhap - LIGHT THEME
   ═══════════════════════════════════════════════════════════ */

body.trang-dang-nhap {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #e8f0fc 0%, #f5f8ff 50%, #eaf3fb 100%);
    position: relative;
    overflow: hidden;
}

.hop-dang-nhap {
    position: relative;
    z-index: 10;
    background: #ffffff;
    border: 1px solid rgba(0, 90, 200, 0.15);
    border-radius: 20px;
    padding: 44px 48px;
    width: 100%;
    max-width: 420px;
    box-shadow:
        0 4px 24px rgba(0, 80, 200, 0.1),
        0 1px 4px rgba(0, 0, 0, 0.06),
        0 20px 60px rgba(0, 60, 180, 0.08);
}

.dang-nhap-logo { text-align: center; margin-bottom: 32px; }

.logo-icon-lon {
    font-size: 48px;
    margin-bottom: 12px;
    display: block;
    animation: nhip-tim 3s ease-in-out infinite;
}
@keyframes nhip-tim {
    0%, 100% { transform: scale(1); }
    50%       { transform: scale(1.06); }
}

.dang-nhap-tieu-de {
    font-size: 28px;
    font-weight: 800;
    color: var(--mau-chinh);
    letter-spacing: -1px;
    margin-bottom: 4px;
}

.dang-nhap-mo-ta { font-size: 13px; color: var(--mau-chu-mo); }

.thong-bao-loi {
    padding: 10px 14px;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--canh-tron-nho);
    color: #b91c1c;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 20px;
    display: flex; align-items: center; gap: 8px;
    animation: rung 0.4s ease;
}
@keyframes rung {
    0%, 100% { transform: translateX(0); }
    25%       { transform: translateX(-5px); }
    75%       { transform: translateX(5px); }
}

.dang-nhap-o-nhap { font-size: 14px; padding: 12px 16px; }

.btn-dang-nhap-chinh {
    width: 100%;
    justify-content: center;
    padding: 13px;
    font-size: 15px;
    font-weight: 700;
    margin-top: 8px;
    border-radius: 10px;
    box-shadow: 0 4px 16px rgba(0,112,224,0.35);
}

.dang-nhap-chu-thich {
    text-align: center;
    font-size: 12px;
    color: var(--mau-chu-min);
    margin-top: 20px;
}

/* Hieu ung nen sang */
.nen-hieu-ung {
    position: fixed; inset: 0;
    pointer-events: none; z-index: 0;
    overflow: hidden;
}
.vong-tron {
    position: absolute;
    border-radius: 50%;
    animation: noi-len 10s ease-in-out infinite;
}
.vong-tron.v1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(0,112,224,0.07) 0%, transparent 65%);
    top: -150px; left: -150px; animation-delay: 0s;
}
.vong-tron.v2 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(0,180,255,0.06) 0%, transparent 65%);
    bottom: -100px; right: -100px; animation-delay: 4s;
}
.vong-tron.v3 {
    width: 250px; height: 250px;
    background: radial-gradient(circle, rgba(124,58,237,0.05) 0%, transparent 65%);
    top: 40%; left: 55%; animation-delay: 7s;
}
@keyframes noi-len {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50%       { transform: translate(15px, -15px) scale(1.04); }
}